gecko/gfx/layers/ipc/ShadowLayerUtilsX11.h

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 *   Chris Jones <jones.chris.g@gmail.com>
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#ifndef mozilla_layers_ShadowLayerUtilsX11_h
#define mozilla_layers_ShadowLayerUtilsX11_h

#include <X11/extensions/Xrender.h>
#include <X11/Xlib.h>

#include "IPC/IPCMessageUtils.h"

#define MOZ_HAVE_SURFACEDESCRIPTORX11
#define MOZ_HAVE_PLATFORM_SPECIFIC_LAYER_BUFFERS

class gfxXlibSurface;

namespace mozilla {
namespace layers {

struct SurfaceDescriptorX11 {
  SurfaceDescriptorX11()
  { }

  SurfaceDescriptorX11(gfxXlibSurface* aSurf);

  SurfaceDescriptorX11(Drawable aDrawable, XID aFormatID,
                       const gfxIntSize& aSize);

  // Default copy ctor and operator= are OK

  bool operator==(const SurfaceDescriptorX11& aOther) const {
    // Define == as two descriptors having the same XID for now,
    // ignoring size and render format.  If the two indeed refer to
    // the same valid XID, then size/format are "actually" the same
    // anyway, regardless of the values of the fields in
    // SurfaceDescriptorX11.
    return mId == aOther.mId;
  }

  already_AddRefed<gfxXlibSurface> OpenForeign() const;

  Drawable mId;
  XID mFormat; // either a PictFormat or VisualID
  gfxIntSize mSize;
};

} // namespace layers
} // namespace mozilla

namespace IPC {

template <>
struct ParamTraits<mozilla::layers::SurfaceDescriptorX11> {
  typedef mozilla::layers::SurfaceDescriptorX11 paramType;

  static void Write(Message* aMsg, const paramType& aParam) {
    WriteParam(aMsg, aParam.mId);
    WriteParam(aMsg, aParam.mSize);
    WriteParam(aMsg, aParam.mFormat);
  }

  static bool Read(const Message* aMsg, void** aIter, paramType* aResult) {
    return (ReadParam(aMsg, aIter, &aResult->mId) &&
            ReadParam(aMsg, aIter, &aResult->mSize) &&
            ReadParam(aMsg, aIter, &aResult->mFormat));
  }
};

} // namespace IPC

#endif  // mozilla_layers_ShadowLayerUtilsX11_h